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| year | imports | change |
| 1986 | .70 | NA |
| 1987 | .70 | 0.00% |
| 1988 | .70 | 0.00% |
| 1989 | .70 | 0.00% |
| 1990 | .70 | 0.00% |
| 1991 | .80 | 14.29% |
| 1992 | .80 | 0.00% |
| 1993 | .80 | 0.00% |
| 1994 | .80 | 0.00% |
| 1995 | 3.40 | 325.00% |
| 1996 | 3.20 | -5.88% |
| 1997 | 2.50 | -21.88% |
| 1998 | 3.30 | 32.00% |
| 1999 | 2.90 | -12.12% |
| 2000 | 2.50 | -13.79% |
| 2001 | 2.80 | 12.00% |
| 2002 | 3.00 | 7.14% |
| 2003 | 3.20 | 6.67% |
| 2004 | 3.30 | 3.13% |
| 2005 | 3.70 | 12.12% |
| 2006 | 3.60 | -2.70% |
| 2007 | 3.90 | 8.33% |
| 2008 | 4.10 | 5.13% |
| 2009 | 4.10 | 0.00% |
| 2010 | 3.70 | -9.76% |
| 2011 | 3.90 | 5.41% |
| 2012 | 4.20 | 7.69% |
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